Motor.



mswma M. OSNOS.

MOTOR. APPLICATION FILED DEC.24| 1913.

Patented July it, 1916.

lnVantor: Mendel Osnos,

q Mp

His Attorney MENDEL OSNOS, 0F BERLIN, GERMANY, ASSIGNOB TO GENERAL ELECTRIC COMPANY, .i. CBEIOELATIGN .7.? KEV? YORK.

MOT 03-.

Application filed Beceniher 24, 3913.

1 '0 all whom may concern Be it known that I, hilnnnnn Osnos,

subject of the Czar ct Russia, residing at lerlin, Germany, have invented certain new and useful improvements in Motors, oil which the following is a specification.

My invention relates to electric motors. and more especially to a construction of compensated series motors for use in electric locomotives operated from rectifier systems.

When it is desired to operate electric locomotives from rectifier systems, certain pcculiarities of the current supplied by said systems must be taken into account in the cimstruction of the motors. It will be understood that with rectifier systems the voltage supplied is apulsating voltage which may be divided into two components, one an alternating current and the other a direct. current of constant value. Since the purpose of rectifying an alternating current is to make it like a direct current, it will be seen that it is desirable to smooth out the pulsations of voltage received from the direct current side oi the rectifier. Evidently, pulsations of voltage induce pulsating fluxes in the field olthe motor supplied therefrom, and such pulsations of flux linking with the coils of the armature which are short circuitcd by the brushes will produce a transformer action and give poor commu-, tation. By smoothing out such a pulsating voltage it is possible to prevent pulsations in flux in the field of the motor and to thereby secure good commutation.

The object of my invention is to provide such a construction of a compensated series motor that good comumtation may be socured duringoperation with pulsating current. l attain this result as a whole by two arrangements which may be used separately, or combined. 1 first seek to prevent pulsations of flux in the cxcitcr axis of the n'lotor, and i do this either by using a small air gap in this axis and thereby securing a saturated field, or by setting up" a neutralizing flux, by means of a short-circuited winding in inductive relation to the main field winding, which shall be equal and opposits to the pulsating flux. This short circuitcd'winding may be combined with the compensating winding. Next, I may attain the desired result by increasing the self induction in the work axis. Such an increase in self induction may be brought about by Specification of Letters Patent.

Patented July 4t, 19%.

ScrialNo,808,B05.

using a large air gap in this axis and there.

by preventing saturation; or, further, by using an uneven distribution oi the compei'lsating windin in the accompanying drawing, Figure 1 is a diagrammatic view showing a motor provided with a short circuited winding in inductive relation to the main field winding; Fig. 2 shows such a Winding combined with the compensating winding of the motor; Fig. 3 is a diagrammatic view representing a vertical transverse section of a motor embodyin my invention.

As previously described, I may prevent pulsations of flux in the exciter axis by making the air gap in this axis of small size and thereby saturating the field. This is shown in Fig. 3, where the air gap in the exciter axis E is small, thereby enabling the exciting winding 1:; to readily saturate the field. The result oi this is that the magnetization of the field will be long that part ofthe magnetization curve which is substantiallyhorizontal. Evidently, there fore, the small changes in field current produced by the pulsating voltage will have practically no effect, and pulsations of flux. will be avoided. I may also attain the same result by the use of a short-circuited winding either alone or in combination with other features. One form of such a winding is shown diagrammatically in Fig. l, where the motor 1 is provided with a compensating winding 2, of any desired form, arranged in the work axis of the motor, and main field winding 3. arranged in the excitcr axis thereof. A short-circuited winding 4-. is shown in inductive relation to this field winding 5- It" the motor 11 is provided. as shown in Fig. 2, with a distributed compensating winding 12, whose terminals lie in the work axis, and an exciting winding 13 in the cxciter axis, I may combine my short-circuitcd winding with the compensating winding by providing a short circuit ll across the mmpensating winding at such points that it will lie in the excitcr axis of the motor. The pulsating currents in the motor will then induce currents in the short-circuited winding which will set up a pulsating flux which will be equal and opposite to the pulsating flux caused by the current in the main field. By thus neutralizing pulsations of flux, transformer action and sparking will be prevented. lVheu the short-circuitecl winding and the n neutralizing 3115; act men as. prsvlmzsiy (iQ-SCZrbEd.

the wurk 4 min W, and thereby inar.

lefl'ents By making the thefwnrk was 05 the motor Marge, I i ahokmg eifect which is c-s-znpnmbln 01' separately, I may compensrrting winciing cnmbineu as shown in Fig. of she drawing, the 11 .1% sahions of the current minced 'dqezt'ein by reason 8f the Sheri circuit 14, will set up g in the same inn-n In order in increase the self induction self? induction of nm (mmpensating an. zirrsmtare Winnings I marlin: air {zap in this,

\J axis 01. iarge size, as Shawn by pre'vnntmg animation n.

pmdnced, by a. choke coil in serins with motor. Cumbineci with this n.z"nn emen arrange the .901 pensi ting winding 91'? the maker that it be nnwelniy ciistr "outed monnd the. perip ery and be disposed in a few slots. W his nnmner of armn mg 31.2 00:11pm Winding, exact cmnpensatinn for the. ar:

rm renaizicn will. not be odiained, but I 1 triimrion of c0n1; "s.i1ing w'ndinp; risen, ii; 13 erxdnna inn t 1319.

(inncy Wm'iid he in entirely jil 'jvif-l'lt 4 '1 work and 1'10 such flux along selfindanw rn of me mmpensuting an is murmur i y iesiedmin :unfiarstmn .31 I haw dinner 8% 1 atts independnnfiy szmmend. I

I nave, thereinre, prnvifie ii such mnstruatiun of eonapensated series motor flmt I may Qpemte fin: name: from afirectifiez:

rind- 9M1 manure. grind cn'snmutatimi. (him I burn shown. and cinscrihei herein the nest. embmliment, of my invention now knawn to .1110, I cunmivc that "ml'imir. nmdi- 01" this exact armngemenf; might be, nmdn, and I therefore in nnt wish t be Unified in what I have SilUV-F" but 'nrsek to in the- "m' minded ciui; sun modimin 3212 scope and spirit of In invm awn;

W W .1: n5: new anti (I str-ix z-"ncnre mm of m. J Eitfl. S .L. in (:mabinatinn. smirce 0f .BS n'mtor, said nmtm': g an 0,. 1mm W riding. a com-- p nszit 1g winding, .1 mans for prevent ing ynlsntions of in in its exciting axis cn -aspnnding 1 Elm pnisnriona (if current,

1 (RHi'lifil'ibiirfgj :2. shmtircui t for said 00mnensating winding arra'mgeri in the. exciting combination, a snnrce of pulsating -current and :1 canipnnsni ed sari-3s,- motor said 5 r raving an nrmntnre \rinding a noun 328mg" winding, means: fur mcremsmg the '-n1 2nctmn of the cunngensnting and arm- We windings and means for preventing pnisaions 91 91112; in 1": exciting axis c0rrev nonding to the pins runs of current, :0mrising a saturated field in Saki axis.

2. n combination. :2 source o'fpnisating CPZ'I'GA t um} compensn .e ies motor, said meter raving an :irnmt: winding, an ex- Cliiiilg wmdmg, a com; sntmg winding, .r-euJs 17hr mcrenmng ho new-induction of armature Windpmsntnms 0f rmdmg to the nil mums Fm." pravcnh the en-citing axis com "p of cnrrern cmnprising means k sin-Jeri eientrim' i cirauit in 1in- .122111% in 1; ng Winding mrnbinatimn n mrce 0i pulsating ins; motor, said 7 lanai-fire winding. mien l, a. cumpensming Winding, "rtrensing *5 mnt'l'ir windings, .warrenting pnisntmns 0f flux 2.31s correspm'zding to the nrrnnt.rinnprising a short compansating winding ara ring fli'iz. In combination. 21 50mm of pnisntingz; current :md. 21 cmnpssnsntml series nlutm', said motor having an armature winning an ex- Qiting winding, compensating winding, means fox-increasing the self-induction of the compensating andnrnmbure windings, and means for preventing pulsations of flux in the. exciting axis corresponding to the pulsations of current. comprising a sntw rated field fore in said 1.: nnd means pmviding it closed eiecbri-ini circuit in indu'cw tire relation to tin. milling winding. f

in .riti'wss when I have hereunto set hand this 13th day of December, 1913.

MEN DEL OSN()S.

mnnNnL-MANN, 'iiizn ils'rL-w KRAMER.

self-iridnntion of 

